You just put the seedlings straight into this soil, no need to add anything until you see signs that your plant is getting hungry (usually around a month give or take a week or two, strain dependant..sometimes more if you keep potting up)
Nutrient wise, I'm seeing many growers here having a great time with Buddhas Tree Organicus 99% which feeds both during veg and flower stage so very simple to use, Biotabs are also a great one to look at, just stick the tabs into the soil (not straight away..maybe 3-4 weeks growth ...not 100% sure on that so maybe another member can advise with the time schedule). Biobizz line up is good but unfortunately many do have trouble with it, some do not.. read this post by Bud Lightyear - Clicky
Many more I'm sure others can advise with too
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